the only adivice i got for you is to stay focused on your homework and nothing BUT your homework. it helps, actually. try not to have any TVs on or anything that'll distract you from working. This may or may not be helpful to you, but it was for me.

As soon as you get home start your homework. turn off your phone, keep your computer off, if you have a desk, put it against a wall so you have no distractions. if something gets boring, or hard, switch the subjects. make sure you dont leave until your work is done. maybe make a promise to yourself that after you are done you can get some kind of reward. unless homework has to be typed up, stay off the computer. and if you must be on the internet, for research or whatever, do NOT be tempted into "multi-tasking" by playing games. I hope this helps.(: